I am currently in Grand Case, have been for last 4 nights - heading to OBBR for a week today. As mentioned by JD, if larger then a party of 4, I would suggest reservations or if you wanted a specific table request. For example, the only reservations we made this week for our group of 4 was for Ocean 82 at sunset. I wanted a specific table so I emailed a request 3 days in advance. Dinner and sunset was amazing! Other then that, we strolled the street and said " this looks good" and walked in. If staying in Grand Case, dinner selection/options are countless. They only other time I would worry about a reservation if I was coming to GC by cab and going to specific establishment, then I would make reservations the day before. Enjoy!